Bug 1437741 - Part 2: Map datachannel to an m-line after all RTP transceivers have been mapped. r=drno

MozReview-Commit-ID: 3hUvFaTYldx

--HG--
extra : rebase_source : 23beaa415109cb809198ae097d2821d9c0c52dc7

media/webrtc/signaling/src/jsep/JsepSessionImpl.cpp

@@ -1419,6 +1419,16 @@ JsepSessionImpl::GetTransceiverForLocal(size_t level)
 
   // There is no transceiver for |level| right now.
 
+  // Look for an RTP transceiver
+  for (RefPtr<JsepTransceiver>& transceiver : mTransceivers) {
+    if (transceiver->GetMediaType() != SdpMediaSection::kApplication &&
+        !transceiver->IsStopped() && !transceiver->HasLevel()) {
+      transceiver->SetLevel(level);
+      return transceiver.get();
+    }
+  }
+
+  // Ok, look for a datachannel
   for (RefPtr<JsepTransceiver>& transceiver : mTransceivers) {
     if (!transceiver->IsStopped() && !transceiver->HasLevel()) {
       transceiver->SetLevel(level);